I have JBOD and Cassandra installed on it. I'm trying to figure out if my disk are totally free or they are boring. The sar -d result is in the end. As I understand until %util is low (less then 1) it ...

I am trying to understand why my system is running slowly. I found the sar command, but wanted to know the difference between sar -B and sar -W
I read the man page, and I understand that -B gives me ...

On a Linux server sar -b reports much too high read block statistics, sometimes 3.500.000 readb/s peak and around 2.500.000 readb/s sustain, which makes more that 1 gigabyte/s (according to the sar ...

I have systat version 7.0.2 and the /etc/sysconfig/sysstat has the entry HISTORY=27, this is on a redhat enterprise server 5.6, the cron setup for this is
# run system activity accounting tool every ...

We are using SuSE 10 OS and lately I wish to know the total network bandwidth used for a period of time lets say for 1 week.
We have sar enabled and the sar data for a week is there.
Now I know how ...

I'm trying to track io usage of a few "suspect" processes over time. Ideally would like to make those stats available via munin, or push directly to graphite. However, as a starting point it would be ...

I'm trying to estimate IOPS requirements of my application running on 32-bit CentOS 6.2. I started to take some measurement on a machine with SATA disks and I'm quite confused of difference between ...

The free commands gives the amount of free memory in two forms: completely free memory (the Mem line) and disposable memory used for caches and buffers (the -/+ buffers/cache line):
-bash-3.2$ free ...

I have a MySQL Server that should be performing better than it seems to be. We're running ubuntu on a Amazon Cluster Compute (cc1.4xlarge)
Linux ip-10-0-1-60 3.2.0-25-virtual #40-Ubuntu SMP Wed May ...

I want to be able to generate the system activity report every 30 seconds or every minute and store in a file and use it for diagnostic purposes on my VM. So I give an output file for the sar command ...

I'm trying to narrow down the list of suspects of web servers that perform moderately well most of the time with occasional bouts of poor performance. I'm analyzing the data collected and summarized ...

In my CentOS server, when I check the resources with sar command, user cpu usage is around %15 while in top command the sole 'java' process uses like %99 of cpu. sometimes it's even goes further than ...

I once saw report that contained information, that within given time frame, total number of x cpu minutes, were used, and this was: - afterwards was list of uids (or usernames), and total number of ...

The load on my server is very high, even though there doesn't seem to be much disk activity and the CPU is idle. Using sar, I can see the run queue is getting full, but is there any way to see what's ...